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03/11/2016#0183;#32;The gold deposits and occurrences in Suriname are part of a major zone of gold mineralisation in the Palaeoproterozoic granitoidgreenstone belt of the Northern Guiana Shield, which runs from Venezuela to NE Brazil (Fig. 20; Gibbs amp; Barron, Reference Gibbs and Barron 1993; Voicu et al., Reference Voicu, Bardoux and Stevenson 2001; Dardenne amp; Schobbenhaus, Reference
04/12/2017#0183;#32;Three main types: lateritic, saprolitic, paleochannel. Paleochannel. There are three types of gold enrichments in the regolith: lateritic ones where the enrichment is in the ferruginous units ovelying upper saprolite or mottled zone, saprolitic ones where the enrichment is in the upper or lower saprolite and paleochannel deposits where the enrichment is either in the saprolite
The saprolitic ore corresponds to oxidized mineralization between the weathering front and the mottled zone. The lateritic ore is comprised of a dispersion halo in ferruginous pisoliths and retains its ''mushroom'' distribution, even where buried. In oregrade laterite deposits, gold mineralization is much larger (several kilometres long) in pisoliths than in saprolite and is thought to have formed by residual concentration
Mesothermal gold deposits have formed over more than 3 billion years of Earths history, episodically during the Middle Archaean to younger Precambrian, and continuously throughout the Phanerozoic. Mesothermal gold deposits are characteristically associated with deformed and metamorphosed midcrustal blocks, particularly in spatial association with major crustal structures shear zone or
At this deposit, gold is homogeneously distributed when mineralized zones are in laterites and erratic when in saprolites ( and others, 1988). TYPICAL ALTERATION/OTHER HALO DIMENSIONS: Iron oxide and clay mineralogy may indicate chemical enrichment.
The saprolitic ore corresponds to oxidized mineralization between the weathering front and the mottled zone. The lateritic ore is comprised of a dispersion halo in ferruginous pisoliths and retains its mushroom distribution, even where buried. In oregrade laterite deposits, gold mineralization is much larger (several kilometres long) in pisoliths than in saprolite and is thought to have formed by residual concentration
GOLD GRADE, IN GRAMS PER METRIC TON TONNAGE, MILLION METRIC TONS. Figure 50 Percentile versus grade and tonnage curves for II Lateri te#173; saprolitequot; gold deposits (after Bliss, 1992). Supergene gold deposits associated with the lateritic profile are generally of a low grade nature.
01/11/2001#0183;#32;Primary and saprolitic Au mineralization is indicated by a broad Au anomaly (100 to gt;1000 ppb) in the soils and lateritic residuum, and by high concentrations of W (5 to gt;40 ppm), Sb (7 to gt;16 ppm) and As (10200 ppm). High K contents, corresponding to resistant muscovite, give surface expression to the alteration zone.
In the Ity gold area, Ivory Coast, the Au contents of the laterite profiles are variable (8 25 g#183;t 1) and are strongly depleted at the surface (around 1 g#183;t 1) [6]. They noticed that Au particles are fine (lt;10 microns) in the saprolite and become larger in the nodular horizon. Moreover, in the lateritic profiles of
bulk of the gold endowment may be found in the placer deposits. Lowsulfide goldquartz vein deposits subjected to deep tropical or temperatehumid weathering can produce lateritic or saprolitic (eluvial placer) deposits (McKelvey, 1992). Deposit size The size of lowsulfide goldquartz deposits varies considerably from region to region. Archean
The lateritic gold deposits are more or less flatlying zones contiguous with the ferruginous horizon and underlying mottled zone of the weathering profile. They contain residual, Agbearing, primary gold as finegrained particles and rare nuggets, and Agpoor secondary gold, commonly as very fine grained particles but with some euhedral crystals, typically associated with iron oxides.
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